Security bounds in quantum cryptography using d-level systems
Security bounds in quantum cryptography using d-level systems
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发表时间：
2003-03
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通讯作者：
A. Acín;N. Gisin;V. Scarani
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作者：
A. Acín;N. Gisin;V. Scarani
分析了在基于克隆机器的个体窃听攻击和基调和后的测量下，使用2或d+1个最大共轭基的d能级系统的量子密码方案的安全性。我们考虑经典的优势蒸馏协议，即使在诚实各方之间的互信息小于窃听者的信息的情况下，该协议也允许提取密钥。在这种情况下，优势蒸馏协议被证明与量子蒸馏一样强大：当且仅当基于纠缠的协议中的相应态是可蒸馏的时，使用经典技术才可能进行密钥蒸馏。
We analyze the security of quantum cryptography schemes for d-level systems using 2 or d + 1 maximally conjugated bases, under individual eavesdropping attacks based on cloning machines and measurement after the basis reconciliation. We consider classical advantage distillation protocols, that allow to extract a key even in situations where the mutual information between the honest parties is smaller than the eavesdropper's information. In this scenario, advantage distillation protocols are shown to be as powerful as quantum distillation: key distillation is possible using classical techniques if and only if the corresponding state in the entanglement based protocol is distillable.